Many thanks, Valda, for your detailed reply. I am inclined to think that Sarah was being a little less than totally forthcoming when she presented John for baptism, and allowing the curate or clerk to think that she was the wife of John Crouchley when she wasn't, or if she was, he wasn't the father.
John Binny does not refer to John William Crouchley as his son, but after John Binny's death the child was taken in by John Binny's brother Thomas, also a wealthy nabob who had returned from India and bought estates in his home county, and, as the Brechin record shows, was then known as John William Binny (JWB). JWB was educated far above the station of a servant's son, being sent to no less a school than the Edinburgh Academy. The school records name his father as John Binny; the question is, which John Binny was this?
(in 1834 JWB went to India to join the family firm, founded by John Binny in Madras, and in 1839 went to Australia with William Speid, a nephew of Thomas and John Binny, who had also worked with the House of Binny in Madras. They settled land in Violet Town, Australia Felix, but did not last very long; William returned to Scotland in 1844, and JWB stayed on for a few more years, then disappeared from the records there. He may or may not be the JWB, clerk, who is listed in the Victorian postal directories at Ten-Mile House, 180 miles from Melbourne, in 1869/71, and/or the JWB, clerk or admin at a hospital in Woods Point, Victoria in 1884/5.)
I have John Binny's will, but I will have to try the Death Duty registers to see if they just might specify the exact relationship of JWB to John Binny. Thank you for your help.